Which of following sentences is correct?

• [Either/neither] + noun + [or/nor] + singular noun + singular verb.
- Neither the salesmen nor the marketing manager is in favour of the system.

• [Either/neither] + noun + [or/nor] + plural noun + plural verb.
- Neither Jony nor his friends are going to the beach today.

So, Correct Sentence - Either the teacher or the students are to blame.